December 2010 ACT Math Discussion

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It said that the new line was a reflection of something at the midpoint of the height of the rectangle. In addition to the other information given, the answer was half of the height, or 7.5.

The mathematical way to do this one was to factor a 16 out of the problem and then foil it. Once you did this, you quickly find that the answer is 1. (Or you could have substituted 1 for x in the equation; since 1 was the first answer choice, this’d probably have been a fast way to find the answer as well.)

For the question regarding the 5 people standing in the line, the answer was 5!. (5<em>4</em>3<em>2</em>1=120). (Since one person can stand in any 5 places in the line, the second person can stand in any of the four remaining places, etc.)</p>

<p>Nah, pretty sure it was 1 second.</p>

<p>Definitely 1.
64=-16t^2+32t+48
when t=1, 32+48-16=64
Anyone have an answer to the a^m<(-a)^n question?</p>

<p>Wow. Maybe I got it wrong. I remember typing the equation into my calculator, plugging in all 5 and getting 48 (or 64?) for one of them. I would swear it was the second one though…efffffmylife100times</p>

<p>EDIT: hopefully I just misremember (lol) what I got. Cause I remember thinking it was sooo easy. </p>

<p>Can someone shed some light on what question the (7,0) one?</p>

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<p>M is less than N and N is even. (An odd answer exponent would make -a insanely small and negative, while the left is positive, thus it must be even. M must be less than n or else a would obviously be bigger if n was even.)</p>

<p>I got one, too! </p>

<p>Can someone please explain the midpoint/7.5 question?</p>

<p>Anyone know the 5 combination one? I thought it’d be an easy question just by looking at it but none of my calculations turned out to be an answer…</p>

<p>@lebonbonbonbonbonbbonbonbonbon</p>

<p>The rectangle was 15 wide. It was reflected across the midpoints. The middle line acted as the x axis, thus it stayed the same distance on both sides. (15/2)=7.5</p>

<p>Oh sorry I didn’t notice all the responses thanks, Oregon senior I looked and 120 wasn’t an answer?. I did 5! too, so I chose the next best thing: 125. Eek.</p>

<p>Haha thank you nwgolfer, I guess I didn’t get the rectangle part so i assumed it was measured from anywhere and confused myself!</p>

<p>Wait, 120 wasn’t an answer? Do you remember what the question was exactly then? I must have either read it incorrectly or I’m thinking of something entirely different (perhaps a question from a practice test that I took a while ago? Who knows.) Were there more people that were eligible to stand in line but only 5 spots open?</p>

<p>EDIT: Nevermind, people have confirmed that 120 was indeed an answer. Thanks Nwgolfer and ACTTester for the confirmation.</p>

<p>@oregonsenior…I did 5! and it was an answer.</p>

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120 was an answer. Please don’t mislead people.</p>

<p>Do any of you guys remember the question where one of the answer choices was something being between -1 and 0?
Not very specific, I know, but that’s all I remember from it.</p>

<p>Hmm I don’t remember, as I didn’t really get to go back to the question before time was called. The choices were something like, 5,15,125,something in the thousands… Haha i was hoping someone would remember. I’m pretty sure there was no 120 because that’s what I got too. Unless I skimmed over that answer choice. I sure hope not…</p>

<p>Oh sorry, I guess I missed it, thanks acttester</p>

<p>Does anyone remember what answer choice they put for a^m (-a)^n or whatever? I can’t remember which one I said, just a general sense of what <em>letter</em> it was.</p>

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No problem, hopefully you had that down as your answer and mistook it for 125 (which was not an answer choice).</p>

<p>@requiem-awesome username-and yes i remember that.
like x^2<x when…
its x= 0 <x< 1</p>

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<p>Was it about the 25 germs tripling every hour? (btw, what was the answer to that?)</p>

<p>^no, chopperx.
it was the people in a line thing.</p>